#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<iostream>
using namespace std;
int main()
{
	int h = 0;
	int r = 0;
	scanf("%d %d", &h, &r);
	if (h >= 1 && h <= 500 && r >= 1 && r <= 100)
	{
		double V = 3.14 * r * r * h * 1 / 1000;
		double water_num = 20/V;
		int water_num2 = (int)water_num;
		printf("%d", water_num2 + 1);
	}
	return 0;
}